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Concentration of Credit Risk - Total Revenue (Detail) (USD $) In Thousands, unless otherwise specified | 12 Months Ended
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Dec. 31, 2012 | Dec. 31, 2011 | Dec. 31, 2010
Virtus Multi Sector Short Term Bond Fund Member |  |  |
Concentration Risk [Line Items] |  |  |
Investment management, administration and transfer agent fees | $ 39,475 | $ 24,445 | $ 14,506
Virtus Emerging Markets Opportunities Fund [Member] |  |  |
Concentration Risk [Line Items] |  |  |
Investment management, administration and transfer agent fees | 29,818 |  |
Virtus Premium AlphaSector Fund [Member] |  |  |
Concentration Risk [Line Items] |  |  |
Investment management, administration and transfer agent fees | 27,987 |  |
DNP Select Income Fund Member |  |  |
Concentration Risk [Line Items] |  |  |
Investment management, administration and transfer agent fees |  |  | $ 14,959
Sales Revenue, Services, Net [Member] | Virtus Multi Sector Short Term Bond Fund Member |  |  |
Concentration Risk [Line Items] |  |  |
Percent of total revenue | 17.00% | 14.00% | 10.00%
Sales Revenue, Services, Net [Member] | Virtus Emerging Markets Opportunities Fund [Member] |  |  |
Concentration Risk [Line Items] |  |  |
Percent of total revenue | 12.00% |  |
Sales Revenue, Services, Net [Member] | Virtus Premium AlphaSector Fund [Member] |  |  |
Concentration Risk [Line Items] |  |  |
Percent of total revenue | 12.00% |  |
Sales Revenue, Services, Net [Member] | DNP Select Income Fund Member |  |  |
Concentration Risk [Line Items] |  |  |
Percent of total revenue |  |  | 10.00%

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- Definition For an entity that discloses a concentration risk in relation to quantitative amount, which serves as the "benchmark" (or denominator) in the equation, this concept represents the concentration percentage derived from the division. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 275 -SubTopic 10 -Section 50 -Paragraph 18 -URI http://asc.fasb.org/extlink&oid=6927468&loc=d3e6351-108592 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 21 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=7491637&loc=d3e13537-108611 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 275 -SubTopic 10 -Section 50 -Paragraph 20 -URI http://asc.fasb.org/extlink&oid=6927468&loc=d3e6404-108592 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 20 -URI http://asc.fasb.org/extlink&oid=7491637&loc=d3e13531-108611 + Details
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- Definition Revenue From Investment Management Administration And Transfer Agent Fees + References No definition available. + Details
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